I've been trying everything now - including reinstallation - without success: krystle 3.1.1 in moodle 2.5.1 refuses to display mypage:
Exception - Unknown type
Debug info:
Error code: generalexceptionmessage
Stack trace:
line 635 of /theme/krystle/lib.php: Exception thrown
line 542 of /theme/krystle/lib.php: call to krystle_expand_navigation->expand()
line 505 of /theme/krystle/lib.php: call to krystle_expand_navigation->initialise()
line 316 of /theme/krystle/renderers.php: call to krystle_expand_navigation->__construct()
line 327 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 278 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 20 of /theme/krystle/layout/frontpage.php: call to theme_krystle_topsettings_renderer->navigation_tree()
line 847 of /lib/outputrenderers.php: call to include()
line 777 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
line 153 of /my/index.php: call to core_renderer->header()

Hi Bernhard - I have not been able to replicate this issue either with krystle3.1.1 (a recoloured version of which is running on my work system as the main theme) or on my tests system. However, I have just pushed 3.2 from github onto the plugins database here. Please could you try that and let me know if you still have the problem.

Dear Richard,
thank you very much for the update, I've been waiting for - but I am rather frustrated now:
When trying to update I get:
Strict Standards: Declaration of krystle_expand_navigation::add_category() should be compatible with that of global_navigation::add_category() in /srv/www/virtual/22043/moodle2.mdrs.hd.schule-bw.de/vhostdata/htdoc/moodle/theme/krystle/lib.php on line 490 ï»¿ï»¿ Fatal error: Allowed memory size of 100663296 bytes exhausted (tried to allocate 393216 bytes) in /srv/www/virtual/22043/moodle2.mdrs.hd.schule-bw.de/vhostdata/upload/moodledata/lang/de/moodle.php on line 545
no matter whether I try updating via plugins or the old traditional method of copying. Since I am just a user, trying to get the system back running for reopening school, I guess, I stick to 3.1.1 forgetting about the problem with mypage.
Thanks for the great theme anyhow!

Hi Bernhard - well the good news is those should be quite easy to deal with - the Strict Standards one is a declaration of standards and doesn't prevent it all working when you turn the debugging notices off as you would on a production site - I'm trying to solve getting rid of it completely but haven't succeeded yet, but it doesn't seem to have any impact on the theme running.
The allowed memory size error means asking someone who looks after your server to increase the php memory limits, although it seems strange that its crashing out allocating 393216b when it says the limit is already 100663296b - I haven't had that error since the very early versions of the awesomebar. I know my production system in work has boosted php memory limits, but my test servers at home do not. hmmmmm

Finally I managed to have krystle updated to 3.2 - don't ask me how! On every page I get now:

Navigation node intersect: Adding a node that already exists 73
line 756 of /lib/navigationlib.php: call to debugging()
line 322 of /lib/navigationlib.php: call to navigation_node_collection->add()
line 298 of /lib/navigationlib.php: call to navigation_node->add_node()
line 2380 of /lib/navigationlib.php: call to navigation_node->add()
line 849 of /theme/krystle/lib.php: call to global_navigation->add_course()
line 589 of /theme/krystle/lib.php: call to krystle_expand_navigation->add_course()
line 345 of /theme/krystle/renderers.php: call to krystle_expand_navigation->expand()
line 353 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 351 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 278 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 20 of /theme/krystle/layout/frontpage.php: call to theme_krystle_topsettings_renderer->navigation_tree()
line 847 of /lib/outputrenderers.php: call to include()
line 777 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
line 101 of /index.php: call to core_renderer->header()
Navigation node intersect: Adding a node that already exists 70
line 756 of /lib/navigationlib.php: call to debugging()
line 322 of /lib/navigationlib.php: call to navigation_node_collection->add()
line 298 of /lib/navigationlib.php: call to navigation_node->add_node()
line 2380 of /lib/navigationlib.php: call to navigation_node->add()
line 849 of /theme/krystle/lib.php: call to global_navigation->add_course()
line 589 of /theme/krystle/lib.php: call to krystle_expand_navigation->add_course()
line 345 of /theme/krystle/renderers.php: call to krystle_expand_navigation->expand()
line 353 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 351 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 278 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 20 of /theme/krystle/layout/frontpage.php: call to theme_krystle_topsettings_renderer->navigation_tree()
line 847 of /lib/outputrenderers.php: call to include()
line 777 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
line 101 of /index.php: call to core_renderer->header()
Zum Hauptinhalt

calling mypage I still get:
Strict Standards: Declaration of krystle_expand_navigation::add_category() should be compatible with that of global_navigation::add_category() in /srv/www/virtual/22043/moodle2.mdrs.hd.schule-bw.de/vhostdata/htdoc/moodle/theme/krystle/lib.php on line 490
Sonderfall - Unknown type
Debug info:
Error code: generalexceptionmessage
Stack trace:
line 652 of /theme/krystle/lib.php: Exception thrown
line 548 of /theme/krystle/lib.php: call to krystle_expand_navigation->expand()
line 506 of /theme/krystle/lib.php: call to krystle_expand_navigation->initialise()
line 338 of /theme/krystle/renderers.php: call to krystle_expand_navigation->__construct()
line 353 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 278 of /theme/krystle/renderers.php: call to theme_krystle_topsettings_renderer->navigation_node()
line 20 of /theme/krystle/layout/frontpage.php: call to theme_krystle_topsettings_renderer->navigation_tree()
line 847 of /lib/outputrenderers.php: call to include()
line 777 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
line 153 of /my/index.php: call to core_renderer->header()

Hi Richard and everybody else,
by accident I found the culprit for not displaying 'My Page':
navshowmycoursecategories has to be disabled in Site administration -> Appearance -> Navigation
Great, now before we reopen on Monday everything works fine!

Updated in github to use latest awesomebar code and minor changes for Moodle2.6 - not fully tested yet, so not ready to release onto the database, but you can grab it from github here in the meantime https://github.com/roelmann/krystle